A stract. Answering an old question in com inatorial geometry, we show that any configuration consisting of a set V of n points in general position in the plane and a set of 6n-5 closed straight line segments whose endpoints lie in V, contains three pairwise disjoint line segments. A geometric graph is a pair G=(V, E), where V is a set of points (=vertices) in general position in the plane, i ....

Aim of this study was to provide an echocardiographic protocol for the description of the normal murine venous reservoir (atrium, appendage and pulmonary veins) and to investigate the possibility to use this approach to discriminate changes on left atrium (LA) and left atrial appendage (LAA) in a stress-induced model such us myocardial infarction. Global left ventricular function and the venous...

Pyrolysis products of proteins and amino acids are highly mutagenic, but metabolism of these chemicals by rat liver subcellular fractions is known to be required for production of the mutagenic intermediates. We examined the mutagenesis of seven purified pyrolysis products from tryptophan, lysine, glutamic acid, and soybean globulin with Salmonella typhimurium strain TA98 in the presence of liv...

BACKGROUND The human immunodeficiency virus 1 (HIV-1) epidemic in China historically stemmed from intravenous drug users (IDUs) in Yunnan. Due to a shared transmission route, hepatitis C virus (HCV)/HIV-1 co-infection is common. Here, we investigated HCV genetic characteristics and baseline drug resistance among HIV-infected IDUs in Yunnan. METHODS Blood samples of 432 HIV-1/HCV co-infected I...

Summary In this article, we prove that for isotropic functions depend on $P$ vectors, $N$ symmetric tensors and $M$ non-symmetric (a) the minimal number of irreducible invariants a scalar-valued function is $3P+9M+6N-3,$ (b) vectors vector-valued $3$ (c) tensor-valued at most $9$. The numbers given in (a), are, general, much lower than obtained literature. This significant reduction has potenti...

between the C57BL/6N and the C57BL/6C substrains (Mekada et al., 2009). Given the status of " C57BL/6 " as a standard genetic background for behavioral studies with mutants (Crawley et al., 1997), it is important to compare the substrains and describe any differences. Indeed a number of studies demonstrated significant differences between C57BL/6J and C57BL/6N on measures of ethanol preference,...

We give a simple interpretation and a simple implementation of the classical divide-andconquer algorithm for computing 3-d convex hulls (and in particular, 2-d Delaunay triangulations and Voronoi diagrams). The entire C++ code is under 100 lines long, requires no special data structures, and uses only 6n pointers for space.

We study D-branes on a three complex dimensional nonabelian orbifold C/Γ with Γ a finite subgroup of SU(3). We present general formulae which are necessary to obtain the gauge group and the spectrum of the D-brane worldvolume theory for dihedral-like subgroups ∆(3n) and ∆(6n). Physical implications of the formulae are discussed. ∗ e-mail address: [email protected]

In this paper, we study the minimum size 2-edge connected spanning subgraph problem (henceforth 2EC) and show that every 3-edge connected cubic graphG = (V,E), with n = |V | allows a 2EC solution for G of size at most 7n 6 , which improves upon Boyd, Iwata and Takazawa’s guarantee of 6n 5 .